This does not mean that radiometric dates or any other scientific measurements are unreliable.billion years, the chronometric age of a sample can be calculated.
One half-life is the amount of time required for of the original atoms in a sample to decay.
As a result, there is a changing ratio of carbon-14 to the more atomically stable carbon-12 involves actually counting individual carbon-14 atoms.
This allows the dating of much older and smaller samples but at a far higher cost.
Since the magnetic field progressively changes with time in a predictable way Whenever possible, paleoanthropologists collect as many dating samples from an ancient human occupation site as possible and employ a variety of chronometric dating methods.
In this way, the confidence level of the dating is significantly increased.